Backing out patch. Will refactor to remove the AsmParser dependency on Target.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142323 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 38 insertions, 116 deletions

diff --git a/include/llvm/Target/TargetData.h b/include/llvm/Target/TargetData.h
index d116f392fb..26fd1870ac 100644
--- a/include/llvm/Target/TargetData.h
+++ b/include/llvm/Target/TargetData.h
@@ -44,7 +44,7 @@ enum AlignTypeEnum {
   AGGREGATE_ALIGN = 'a',             ///< Aggregate alignment
   STACK_ALIGN = 's'                  ///< Stack objects alignment
 };
-
+  
 /// Target alignment element.
 ///
 /// Stores the alignment data associated with a given alignment type (pointer,
@@ -80,7 +80,7 @@ private:
   unsigned      StackNaturalAlign;     ///< Stack natural alignment
 
   SmallVector<unsigned char, 8> LegalIntWidths; ///< Legal Integers.
-
+  
   /// Alignments- Where the primitive type alignment data is stored.
   ///
   /// @sa init().
@@ -88,7 +88,7 @@ private:
   /// pointers vs. 64-bit pointers by extending TargetAlignment, but for now,
   /// we don't.
   SmallVector<TargetAlignElem, 16> Alignments;
-
+  
   /// InvalidAlignmentElem - This member is a signal that a requested alignment
   /// type and bit width were not found in the SmallVector.
   static const TargetAlignElem InvalidAlignmentElem;
@@ -112,30 +112,19 @@ private:
     return &align != &InvalidAlignmentElem;
   }
 
-  /// Initialise a TargetData object with default values, ensure that the
-  /// target data pass is registered.
-  void init();
-
 public:
   /// Default ctor.
   ///
   /// @note This has to exist, because this is a pass, but it should never be
   /// used.
   TargetData();
-
+  
   /// Constructs a TargetData from a specification string. See init().
   explicit TargetData(StringRef TargetDescription)
     : ImmutablePass(ID) {
-    std::string errMsg = parseSpecifier(TargetDescription, this);
-    assert(errMsg == "" && "Invalid target data layout string.");
-    (void)errMsg;
+    init(TargetDescription);
   }
 
-  /// Parses a target data specification string. Returns an error message
-  /// if the string is malformed, or the empty string on success. Optionally
-  /// initialises a TargetData object if passed a non-null pointer.
-  static std::string parseSpecifier(StringRef TargetDescription, TargetData* td = 0);
-
   /// Initialize target data from properties stored in the module.
   explicit TargetData(const Module *M);
 
@@ -152,6 +141,9 @@ public:
 
   ~TargetData();  // Not virtual, do not subclass this class
 
+  //! Parse a target data layout string and initialize TargetData alignments.
+  void init(StringRef TargetDescription);
+
   /// Target endianness...
   bool isLittleEndian() const { return LittleEndian; }
   bool isBigEndian() const { return !LittleEndian; }
@@ -160,7 +152,7 @@ public:
   /// TargetData.  This representation is in the same format accepted by the
   /// string constructor above.
   std::string getStringRepresentation() const;
-
+  
   /// isLegalInteger - This function returns true if the specified type is
   /// known to be a native integer type supported by the CPU.  For example,
   /// i64 is not native on most 32-bit CPUs and i37 is not native on any known
@@ -174,7 +166,7 @@ public:
         return true;
     return false;
   }
-
+  
   bool isIllegalInteger(unsigned Width) const {
     return !isLegalInteger(Width);
   }
@@ -259,11 +251,11 @@ public:
   /// getABITypeAlignment - Return the minimum ABI-required alignment for the
   /// specified type.
   unsigned getABITypeAlignment(Type *Ty) const;
-
+  
   /// getABIIntegerTypeAlignment - Return the minimum ABI-required alignment for
   /// an integer type of the specified bitwidth.
   unsigned getABIIntegerTypeAlignment(unsigned BitWidth) const;
-
+  
 
   /// getCallFrameTypeAlignment - Return the minimum ABI-required alignment
   /// for the specified type when it is part of a call frame.
@@ -313,7 +305,7 @@ public:
     assert((Alignment & (Alignment-1)) == 0 && "Alignment must be power of 2!");
     return (Val + (Alignment-1)) & ~UIntTy(Alignment-1);
   }
-
+  
   static char ID; // Pass identification, replacement for typeid
 };
 
diff --git a/lib/AsmParser/CMakeLists.txt b/lib/AsmParser/CMakeLists.txt
index 5dcf48dff9..749601510b 100644
--- a/lib/AsmParser/CMakeLists.txt
+++ b/lib/AsmParser/CMakeLists.txt
@@ -8,5 +8,4 @@ add_llvm_library(LLVMAsmParser
 add_llvm_library_dependencies(LLVMAsmParser
   LLVMCore
   LLVMSupport
-  LLVMTarget
   )
diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index eb6afd36c7..cafaab01af 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -24,7 +24,6 @@
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/TargetData.h"
 using namespace llvm;
 
 static std::string getTypeString(Type *T) {
@@ -261,14 +260,9 @@ bool LLParser::ParseTargetDefinition() {
     return false;
   case lltok::kw_datalayout:
     Lex.Lex();
-    LocTy SpecifierLoc = Lex.getLoc();
     if (ParseToken(lltok::equal, "expected '=' after target datalayout") ||
         ParseStringConstant(Str))
       return true;
-    std::string errMsg = TargetData::parseSpecifier(Str);
-    if (errMsg != "") {
-      return Error(SpecifierLoc, errMsg);
-    }
     M->setDataLayout(Str);
     return false;
   }
diff --git a/lib/Target/TargetData.cpp b/lib/Target/TargetData.cpp
index ff60e0b29c..bd6a6b67be 100644
--- a/lib/Target/TargetData.cpp
+++ b/lib/Target/TargetData.cpp
@@ -125,15 +125,15 @@ const TargetAlignElem TargetData::InvalidAlignmentElem =
 //===----------------------------------------------------------------------===//
 
 /// getInt - Get an integer ignoring errors.
-static int getInt(StringRef R) {
-  int Result = 0;
+static unsigned getInt(StringRef R) {
+  unsigned Result = 0;
   R.getAsInteger(10, Result);
   return Result;
 }
 
-void TargetData::init() {
+void TargetData::init(StringRef Desc) {
   initializeTargetDataPass(*PassRegistry::getPassRegistry());
-
+  
   LayoutMap = 0;
   LittleEndian = false;
   PointerMemSize = 8;
@@ -152,12 +152,6 @@ void TargetData::init() {
   setAlignment(VECTOR_ALIGN,    8,  8, 64);  // v2i32, v1i64, ...
   setAlignment(VECTOR_ALIGN,   16, 16, 128); // v16i8, v8i16, v4i32, ...
   setAlignment(AGGREGATE_ALIGN, 0,  8,  0);  // struct
-}
-
-std::string TargetData::parseSpecifier(StringRef Desc, TargetData *td) {
-
-  if (td)
-    td->init();
 
   while (!Desc.empty()) {
     std::pair<StringRef, StringRef> Split = Desc.split('-');
@@ -175,54 +169,28 @@ std::string TargetData::parseSpecifier(StringRef Desc, TargetData *td) {
 
     switch (Specifier[0]) {
     case 'E':
-      if (td)
-        td->LittleEndian = false;
+      LittleEndian = false;
       break;
     case 'e':
-      if (td)
-        td->LittleEndian = true;
+      LittleEndian = true;
       break;
-    case 'p': {
-      // Pointer size.
+    case 'p':
       Split = Token.split(':');
-      int PointerMemSizeBits = getInt(Split.first);
-      if (PointerMemSizeBits < 0 || PointerMemSizeBits % 8 != 0)
-        return "invalid pointer size, must be a positive 8-bit multiple";
-      if (td)
-        td->PointerMemSize = PointerMemSizeBits / 8;
-
-      // Pointer ABI alignment.
+      PointerMemSize = getInt(Split.first) / 8;
       Split = Split.second.split(':');
-      int PointerABIAlignBits = getInt(Split.first);
-      if (PointerABIAlignBits < 0 || PointerABIAlignBits % 8 != 0) {
-        return "invalid pointer ABI alignment, "
-               "must be a positive 8-bit multiple";
-      }
-      if (td)
-        td->PointerABIAlign = PointerABIAlignBits / 8;
-
-      // Pointer preferred alignment.
+      PointerABIAlign = getInt(Split.first) / 8;
       Split = Split.second.split(':');
-      int PointerPrefAlignBits = getInt(Split.first);
-      if (PointerPrefAlignBits < 0 || PointerPrefAlignBits % 8 != 0) {
-        return "invalid pointer preferred alignment, "
-               "must be a positive 8-bit multiple";
-      }
-      if (td) {
-        td->PointerPrefAlign = PointerPrefAlignBits / 8;
-        if (td->PointerPrefAlign == 0)
-          td->PointerPrefAlign = td->PointerABIAlign;
-      }
+      PointerPrefAlign = getInt(Split.first) / 8;
+      if (PointerPrefAlign == 0)
+        PointerPrefAlign = PointerABIAlign;
       break;
-    }
     case 'i':
     case 'v':
     case 'f':
     case 'a':
     case 's': {
       AlignTypeEnum AlignType;
-      char field = Specifier[0];
-      switch (field) {
+      switch (Specifier[0]) {
       default:
       case 'i': AlignType = INTEGER_ALIGN; break;
       case 'v': AlignType = VECTOR_ALIGN; break;
@@ -230,66 +198,37 @@ std::string TargetData::parseSpecifier(StringRef Desc, TargetData *td) {
       case 'a': AlignType = AGGREGATE_ALIGN; break;
       case 's': AlignType = STACK_ALIGN; break;
       }
-      int Size = getInt(Specifier.substr(1));
-      if (Size < 0) {
-        return std::string("invalid ") + field + "-size field, "
-               "must be positive";
-      }
-
+      unsigned Size = getInt(Specifier.substr(1));
       Split = Token.split(':');
-      int ABIAlignBits = getInt(Split.first);
-      if (ABIAlignBits < 0 || ABIAlignBits % 8 != 0) {
-        return std::string("invalid ") + field +"-abi-alignment field, "
-               "must be a positive 8-bit multiple";
-      }
-      unsigned ABIAlign = ABIAlignBits / 8;
+      unsigned ABIAlign = getInt(Split.first) / 8;
 
       Split = Split.second.split(':');
-
-      int PrefAlignBits = getInt(Split.first);
-      if (PrefAlignBits < 0 || PrefAlignBits % 8 != 0) {
-        return std::string("invalid ") + field +"-preferred-alignment field, "
-               "must be a positive 8-bit multiple";
-      }
-      unsigned PrefAlign = PrefAlignBits / 8;
+      unsigned PrefAlign = getInt(Split.first) / 8;
       if (PrefAlign == 0)
         PrefAlign = ABIAlign;
-      
-      if (td)
-        td->setAlignment(AlignType, ABIAlign, PrefAlign, Size);
+      setAlignment(AlignType, ABIAlign, PrefAlign, Size);
       break;
     }
     case 'n':  // Native integer types.
       Specifier = Specifier.substr(1);
       do {
-        int Width = getInt(Specifier);
-        if (Width <= 0) {
-          return std::string("invalid native integer size \'") + Specifier.str() +
-                 "\', must be a positive integer.";
-        }
-        if (td && Width != 0)
-          td->LegalIntWidths.push_back(Width);
+        if (unsigned Width = getInt(Specifier))
+          LegalIntWidths.push_back(Width);
         Split = Token.split(':');
         Specifier = Split.first;
         Token = Split.second;
       } while (!Specifier.empty() || !Token.empty());
       break;
-    case 'S': { // Stack natural alignment.
-      int StackNaturalAlignBits = getInt(Specifier.substr(1));
-      if (StackNaturalAlignBits < 0 || StackNaturalAlignBits % 8 != 0) {
-        return "invalid natural stack alignment (S-field), "
-               "must be a positive 8-bit multiple";
-      }
-      if (td)
-        td->StackNaturalAlign = StackNaturalAlignBits / 8;
+    case 'S': // Stack natural alignment.
+      StackNaturalAlign = getInt(Specifier.substr(1));
+      StackNaturalAlign /= 8;
+      // FIXME: Should we really be truncating these alingments and
+      // sizes silently?
       break;
-    }
     default:
       break;
     }
   }
-
-  return "";
 }
 
 /// Default ctor.
@@ -303,9 +242,7 @@ TargetData::TargetData() : ImmutablePass(ID) {
 
 TargetData::TargetData(const Module *M)
   : ImmutablePass(ID) {
-  std::string errMsg = parseSpecifier(M->getDataLayout(), this);
-  assert(errMsg == "" && "Module M has malformed target data layout string.");
-  (void)errMsg;
+  init(M->getDataLayout());
 }
 
 void